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Enhanced Interactions between Dipolar Polaritons.

Emre Togan1, Hyang-Tag Lim1, Stefan Faelt1,2

  • 1Institute of Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland.

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|December 15, 2018
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Summary
This summary is machine-generated.

We enhanced interactions between dipolar polaritons, a hybrid light-matter excitation, by increasing dipole size via gate voltage. This advancement is key for future many-body states of light.

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Area of Science:

  • Quantum optics
  • Condensed matter physics
  • Materials science

Background:

  • Hybrid light-matter excitations, or polaritons, arise from coupling cavity photons and excitons.
  • Dipolar polaritons, formed from excitons with aligned permanent dipoles, are predicted to have enhanced interactions.

Purpose of the Study:

  • To investigate and enhance the interaction strength of dipolar polaritons.
  • To explore the role of dipole size in modifying polariton interactions.

Main Methods:

  • Utilized coupled quantum well structures within a microcavity.
  • Created excitonic dipoles via coherent electron tunneling.
  • Tuned dipole size using applied gate voltage.
  • Measured interaction strength by analyzing changes in reflected light intensity under resonant laser driving.

Main Results:

  • Demonstrated a substantial increase in interaction strength between dipolar polaritons.
  • Observed a significant enhancement in the interaction-strength-to-linewidth ratio by a factor of 6.5.
  • Showed that increasing dipole size directly correlates with increased interaction strength.

Conclusions:

  • Dipolar polaritons exhibit tunable and enhanced interactions.
  • These findings represent a significant step towards achieving the polariton blockade effect.
  • Dipolar polaritons could serve as building blocks for novel many-body states of light.